抗裂型水泥稳定碎石配合比设计及路用性能研究

为了提高水泥稳定碎石的抗裂能力,选取广东省佛山地区花岗岩集料,通过大量室内试验进行了抗裂型水泥稳定碎石混合料的配合比设计和路用性能分析.首先,采用两级干捣试验根据骨架间隙率合理极小值获得了三档粗集料的最佳配比,并采用i法和CBR试验得到了CBR值最大的细集料密实级配.其次,采用7d无侧限抗压强度试验,确定了强度最大的粗细集料最佳配比,由此提出了骨架密实结构的抗裂型水泥稳定碎石混合料的设计级配及最佳水泥剂量.最后,通过路用性能检验,并与施工规范悬浮密实级配进行了对比,结果表明,设计级配的各项路用性能均明显优于规范级配.因此,所提出的骨架密实结构水泥稳定碎石混合料具有优良的抗裂性能,可应用于工程实际.

Research on mix design and pavement performances for anti-crack cement stabilized macadam

In order tO improve the anti-crack ability of cement stabilized macadam, the gran- ite aggregates in Foshan Region of Guangdong Province were selected to conduct the mix de- sign and the analysis of pavement performances for anti-crack cement stabilized macadam mixture through a great deal of laboratory experiments. Firstly the two grades of dry-rod- ded experiments were tested to obtain the optimal ratio of three grades of coarse aggregates in accordance with the reasonable minimal value of percent air voids of coarse aggregate. The i method and the CBR tests were applied to determine the dense gradation of fine aggre- gate with the maximum CBR value. Secondly the 7d unconfined compressive strengths were tested to obtain the optimal ratio of coarse and fine aggregates under the maximum strength, then the designed gradation and the optimal cement dosage were put forward for the mixture of skeleton dense structure of anti-crack cement stabilized macadam. Lastly the pavement performances were tested and compared to the suspend dense gradation in the con- struction specifications. The results show that the various pavement performances of the de- signed gradation are significantly better than that of the specification gradation. Therefore, the proposed mixture with skeleton dense structure of cement stabilized macadam has excel-lent anti-crack performance and can be applied in the actual engineering.